Objects implementing this interface can emit events.
Objects with this interface can trigger events, and have an event manager retrieved from them.
The Cake\Event\EventDispatcherTrait lets you easily implement this interface.
dispatchEvent( string $name , array|null $data null , object|null $subject null )
Wrapper for creating and dispatching events.
Returns a dispatched event.
$name $data optional null Any value you wish to be transported with this event to it can be read by listeners.
$subject optional null The object that this event applies to ($this by default).
Cake\Event\EventeventManager( Cake\Event\EventManager $eventManager null )
Returns the Cake\Event\EventManager manager instance for this object.
You can use this instance to register any new listeners or callbacks to the object events, or create your own events and trigger them at will.
Cake\Event\EventManager $eventManager optional null Cake\Event\EventManager
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https://api.cakephp.org/3.4/class-Cake.Event.EventDispatcherInterface.html